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Debt - Summary of Maturities of Long-term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |
Long-term debt maturity | $ 1,174,581 | $ 1,184,132
2018 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt maturity | 298,462 |
2019 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt maturity | 167,191 |
2020 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt maturity | 118,376 |
2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt maturity | 96,070 |
2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt maturity | 89,144 |
Thereafter [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt maturity | $ 405,338 |

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